AS3 calling PHP and Cookies

Which cookies and session data does ActionScript use when calling PHP on the same server via ULRRequest?

Does it use that of the current user’s browser, or does it create it’s “own” cookies/session?

[SIZE=“1”]The reason I ask is, I’m modifying a Joomla install and thinking of adding some features in Flash. However, the features require the user to be logged in on the site at the same time. Since Joomla already has a login system which keeps the user logged in for a small amount of time, I would rather not require users to re-login to the site via the Flash applet.[/SIZE]